Error: Incorrect attribute value type deploying on AWS with Terraform

[edernucci]

What happened:
Error running terraform plan.

What is the expected behavior:
terraform plan should execute without errors.

How to reproduce the issue:

$ terraform plan

Error: Incorrect attribute value type

  on main.tf line 180, in resource "aws_lb" "control_plane":
 180:   subnets            = ["${local.all_subnets}"]

Inappropriate value for attribute "subnets": element 0: string required.

Anything else we need to know?
Using files from https://github.com/kubermatic/kubeone/tree/master/examples/terraform/aws

$ terraform version
Terraform v0.12.0
+ provider.aws v2.11.0

$ cat terraform.tfvars 
cluster_name = "demo"
aws_region = "sa-east-1"

Information about the environment:
KubeOne version (kubeone version):

$ kubeone version
{
  "kubeone": {
    "major": "0",
    "minor": "6",
    "gitVersion": "0.6.2",
    "gitCommit": "7b86c3bf654366a64da608c7b710360dd5f5d777",
    "gitTreeState": "",
    "buildDate": "2019-05-13T16:49:50Z",
    "goVersion": "go1.12.5",
    "compiler": "gc",
    "platform": "linux/amd64"
  },
  "machine_controller": {
    "major": "1",
    "minor": "1",
    "gitVersion": "v1.1.5",
    "gitCommit": "",
    "gitTreeState": "",
    "buildDate": "",
    "goVersion": "",
    "compiler": "",
    "platform": "linux/amd64"
  }
}

Operating system:

$ uname -a
Linux artorias 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u2 (2019-05-13) x86_64 GNU/Linux

Provider you're deploying cluster on:
AWS
Operating system you're deploying on:
Linux

[kron4eg]

Thanks for the report, terraform 0.12 just got release and it seems like out example terraform configs are only 0.11 compatible (despite terraform 0.12checklist claimed otherwise). Most likely we going to copy existing configs and make copies 0.12 compatible, but that'll take some time.

[edernucci]

@kron4eg

This was my first experience with Terraform, so I thought I was doing something wrong.

In this case if I use version 0.11 everything should work smoothly?

[kron4eg]

yeah, we use 0.11 terraform in out e2e tests and it works quite well for us.

[edernucci]

@kron4eg

Just for clarification, I downgraded Terraform, cleaned the directory and started again.

Everything worked as expected with version 0.11.14.

Thanks for your support.

[eqrx]

@edernucci Terraform 0.12 support have just been merged and will be available with the 0.9 release (Should come around the end of this week)